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2016-06-19T21:43:38+08:00
Plate tectonic is a theory that earth's outer shell is divided into several plates

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2016-06-20T06:36:17+08:00
Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. The plates act like a hard and rigid shell compared to Earth's mantle. This strong outer layer is called the lithosphere.
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